Mouth opener c. 1930
On application
A Heister mouth opener (or dilator) of nickel-plated steel with oxidation, marked 7*7 on the inner side of the legs of c.1925-1940.
Similar instruments in the Wellcome collection: https://collection.sciencemuseumgroup.org.uk/objects/co97741/heister-mouth-opener-unsigned
Length: 13,5 cm.
